It is apparent that you only read the introductory page and haven't read the material on the web site regarding eating in the church building since you make arguments against positions not presented on the site (the building is just a building -- no one said otherwise) and arguments you don't believe are true (if you can't eat in the building then you can't have air conditioning).
Whether you personally believe something to be right or wrong doesn't constitute proof. We are followers of Christ and, therefore, do things because it is authorized by Christ. "And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks to God the Father through Him" (Colossians 3:17).
See:
Why is eating in the building an issue?
Is it wrong to have a fellowship building for dinners?
Can we have meals in the building since eating together is an expression of fellowship?
Can a hall used by a church for worship also be rented for a potluck by members?
What Constitutes Obedience?
Finding Liberty in Silence
Can the church pay for things pertaining to the upkeep of the church building?

